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Announcements 1st midterm: grades are online project: I’m in the process of reading …. A few words on the test ... Well done !!!!!! Average score: 19.5/25  B-/C+ Lecture 14 Special relativity I: Speed limit 186000 mi/s and common sense makes no sense A few definitions ...

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Proposal A:take two atomic clocks, put one in an airplane and have the airplane fly once around the Earth. Compare the clock with the other one that stayed at rest. Result: the traveling clock is indeed somewhat behind.

Proposal B:There exist an elementary particle, the muon, which is created when cosmic rays hit the upper levels of the atmosphere. Their lifetime is so short, that they should decay before they reach the surface of the Earth. Nevertheless they are detected. Solution: muons move at speeds close to the speed of light, “life” proceeds much slower.